The range of creatures they care about casts such a wide net that you have a ton of options for building around this commander
Spectral Deluge Spectral Deluge looks like a worse Engulf the Shore at first glance, but despite being more expensive and limited to sorcery speed, it does a couple things so well that it edges out the previous entry
So many words here
Bria, Riptide Rogue Two generic, one blue, one red legendary creature Otter Rogue 3/3 Mythic Rare Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Other creatures you control have prowess (If a creature has multiple instances of prowess, each triggers separately.) Whenever you cast a noncreature spell, target creature you control can't be blocked this turn
Spirit of the Night Spirit of the Night is, reductively, keyword salad
Making the card trade value limit 1 gold star means players who were looking to trade their extremely valuable cards for those of others will not be able to do so, preventing everyone from improving their collection